Transition Metals - Chromium & Vanadium

A green precipitate that dissolves to form a dark green solution on adding excess NaOH contains

• Fe³⁺

• Mn²⁺

• Cu²⁺

• Cr³⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Cr²⁺

• Chromium

• Chromium 2

• Chromate

• Chromium (II)

Tags

NGSS.HS-PS1-1

Cr³⁺

• Chromium (III)

• Chromium

• Chromium (3)

• Chromate (III)

Tags

NGSS.HS-PS1-1

What could the name of the solution on the left be?

• Sodium chromate

• Potassium Dichromate (VI)

• Potassium Chromate (VI)

• Sodium Chromate (VI)

Which is the colour of Vanadium (III)

• Blue

• Green

• Violet

• Yellow

What colour will the Green Cr³⁺ turn after I add H₂O₂ and NaOH?

• Yellow

• Green

• Blue

• Orange

Tags

NGSS.HS-PS1-2

Which one is not a redox reaction

• Cr₂O₇^2- + 14H⁺ + 6e^- ⇌ 2Cr³⁺ + 7H₂O

• Cr₂O₇^2- + H₂O ⇌ 2CrO₄^- + 2H⁺

• Cr₂O₇^2- + 14H⁺ + 6e^- ⇌ 2Cr³⁺ + 7H₂O

• Cr³⁺ + e^- ⇌ Cr²⁺

Tetraaquadihydroxocopper (II) is

• dark blue

• a pale blue ppt

• a blue solution

• yellow (but looks green)

Which is not an example of a ligand substitution reaction?

• [Cu(H₂O)₆]²⁺ + 2OH^- --> [Cu(H₂O)₄(OH)₂] + 2H₂O

• [Cu(H₂O)₆]²⁺ + 4Cl^- --> [Cu(Cl)₄]^2- + 6H₂O

• [Cu(H₂O)₄(OH)₂] + 4NH₃ --> [Cu(H₂O)₂(NH₃)₄]²⁺ + 2H₂O + 2OH^-

• [Cu(H₂O)₆]²⁺ + 3en --> [Cu(en)₃]²⁺ + 6H₂O

An element where the last electron added was into a d subshell is the definition of...

• Transition Metal

• d-block element

• catalytic ion

• complex ion